+++ /dev/null
-From 0f31298eb0a9b2cd7990b709ff18229fadfa474b Mon Sep 17 00:00:00 2001
-From: Biwen Li <biwen.li@nxp.com>
-Date: Wed, 17 Apr 2019 18:58:38 +0800
-Subject: [PATCH] flextimer: support layerscape
-
-This is an integrated patch of flextimer for layerscape
-
-Signed-off-by: Biwen Li <biwen.li@nxp.com>
-Signed-off-by: Meng Yi <meng.yi@nxp.com>
-Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
-Signed-off-by: Zhang Ying-22455 <ying.zhang22455@nxp.com>
----
- .../bindings/soc/fsl/layerscape/ftm-alarm.txt | 32 ++
- drivers/clocksource/fsl_ftm_timer.c | 8 +-
- drivers/soc/fsl/layerscape/ftm_alarm.c | 382 ++++++++++++++++++
- 3 files changed, 418 insertions(+), 4 deletions(-)
- create mode 100644 Documentation/devicetree/bindings/soc/fsl/layerscape/ftm-alarm.txt
- create mode 100644 drivers/soc/fsl/layerscape/ftm_alarm.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/soc/fsl/layerscape/ftm-alarm.txt
-@@ -0,0 +1,32 @@
-+Freescale FlexTimer Module (FTM) Alarm
-+
-+Required properties:
-+
-+- compatible : Should be "fsl,ftm-alarm" or "fsl,<chip>-ftm-alarm", the
-+ supported chips include
-+ "fsl,ls1012a-ftm-alarm"
-+ "fsl,ls1021a-ftm-alarm"
-+ "fsl,ls1043a-ftm-alarm"
-+ "fsl,ls1046a-ftm-alarm"
-+ "fsl,ls1088a-ftm-alarm"
-+ "fsl,ls208xa-ftm-alarm"
-+- reg : Specifies base physical address and size of the register sets for the
-+ FlexTimer Module and base physical address of IP Powerdown Exception Control
-+ Register.
-+- reg-names: names of the mapped memory regions listed in regs property.
-+ should include the following entries:
-+ "ftm": Address of the register sets for FlexTimer Module
-+ "pmctrl": Address of IP Powerdown Exception Control register
-+- interrupts : Should be the FlexTimer Module interrupt.
-+- big-endian: If the host controller is big-endian mode, specify this property.
-+ The default endian mode is little-endian.
-+
-+Example:
-+ftm0: ftm0@29d0000 {
-+ compatible = "fsl,ls1043a-ftm-alarm";
-+ reg = <0x0 0x29d0000 0x0 0x10000>,
-+ <0x0 0x1ee2140 0x0 0x4>;
-+ reg-names = "ftm", "pmctrl";
-+ interrupts = <0 86 0x4>;
-+ big-endian;
-+};
---- a/drivers/clocksource/fsl_ftm_timer.c
-+++ b/drivers/clocksource/fsl_ftm_timer.c
-@@ -83,11 +83,11 @@ static inline void ftm_counter_disable(v
-
- static inline void ftm_irq_acknowledge(void __iomem *base)
- {
-- u32 val;
-+ unsigned int timeout = 100;
-
-- val = ftm_readl(base + FTM_SC);
-- val &= ~FTM_SC_TOF;
-- ftm_writel(val, base + FTM_SC);
-+ while ((FTM_SC_TOF & ftm_readl(base + FTM_SC)) && timeout--)
-+ ftm_writel(ftm_readl(base + FTM_SC) & (~FTM_SC_TOF),
-+ base + FTM_SC);
- }
-
- static inline void ftm_irq_enable(void __iomem *base)
---- /dev/null
-+++ b/drivers/soc/fsl/layerscape/ftm_alarm.c
-@@ -0,0 +1,382 @@
-+/*
-+ * Freescale FlexTimer Module (FTM) Alarm driver.
-+ *
-+ * Copyright 2014 Freescale Semiconductor, Inc.
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2
-+ * of the License, or (at your option) any later version.
-+ */
-+
-+#include <linux/device.h>
-+#include <linux/err.h>
-+#include <linux/interrupt.h>
-+#include <linux/io.h>
-+#include <linux/of_address.h>
-+#include <linux/of_irq.h>
-+#include <linux/platform_device.h>
-+#include <linux/of.h>
-+#include <linux/of_device.h>
-+#include <linux/libata.h>
-+#include <linux/module.h>
-+
-+#define FTM_SC 0x00
-+#define FTM_SC_CLK_SHIFT 3
-+#define FTM_SC_CLK_MASK (0x3 << FTM_SC_CLK_SHIFT)
-+#define FTM_SC_CLK(c) ((c) << FTM_SC_CLK_SHIFT)
-+#define FTM_SC_PS_MASK 0x7
-+#define FTM_SC_TOIE BIT(6)
-+#define FTM_SC_TOF BIT(7)
-+
-+#define FTM_SC_CLKS_FIXED_FREQ 0x02
-+
-+#define FTM_CNT 0x04
-+#define FTM_MOD 0x08
-+#define FTM_CNTIN 0x4C
-+
-+#define FIXED_FREQ_CLK 32000
-+#define MAX_FREQ_DIV (1 << FTM_SC_PS_MASK)
-+#define MAX_COUNT_VAL 0xffff
-+
-+static void __iomem *ftm1_base;
-+static void __iomem *rcpm_ftm_addr;
-+static void __iomem *scfg_scrachpad_addr;
-+static u32 alarm_freq;
-+static bool big_endian;
-+
-+enum pmu_endian_type {
-+ BIG_ENDIAN,
-+ LITTLE_ENDIAN,
-+};
-+
-+struct rcpm_cfg {
-+ enum pmu_endian_type big_endian; /* Big/Little endian of PMU module */
-+ u32 flextimer_set_bit; /* FTM is not powerdown during device LPM20 */
-+};
-+
-+static struct rcpm_cfg ls1012a_rcpm_cfg = {
-+ .big_endian = BIG_ENDIAN,
-+ .flextimer_set_bit = 0x20000,
-+};
-+
-+static struct rcpm_cfg ls1021a_rcpm_cfg = {
-+ .big_endian = BIG_ENDIAN,
-+ .flextimer_set_bit = 0x30000000,
-+};
-+
-+static struct rcpm_cfg ls1043a_rcpm_cfg = {
-+ .big_endian = BIG_ENDIAN,
-+ .flextimer_set_bit = 0x20000,
-+};
-+
-+static struct rcpm_cfg ls1046a_rcpm_cfg = {
-+ .big_endian = BIG_ENDIAN,
-+ .flextimer_set_bit = 0x20000,
-+};
-+
-+static struct rcpm_cfg ls1088a_rcpm_cfg = {
-+ .big_endian = LITTLE_ENDIAN,
-+ .flextimer_set_bit = 0x4000,
-+};
-+
-+static struct rcpm_cfg ls208xa_rcpm_cfg = {
-+ .big_endian = LITTLE_ENDIAN,
-+ .flextimer_set_bit = 0x4000,
-+};
-+
-+static struct rcpm_cfg lx2160a_rcpm_cfg = {
-+ .big_endian = LITTLE_ENDIAN,
-+ .flextimer_set_bit = 0x4000,
-+};
-+
-+static const struct of_device_id ippdexpcr_of_match[] = {
-+ { .compatible = "fsl,ls1012a-ftm-alarm", .data = &ls1012a_rcpm_cfg},
-+ { .compatible = "fsl,ls1021a-ftm-alarm", .data = &ls1021a_rcpm_cfg},
-+ { .compatible = "fsl,ls1043a-ftm-alarm", .data = &ls1043a_rcpm_cfg},
-+ { .compatible = "fsl,ls1046a-ftm-alarm", .data = &ls1046a_rcpm_cfg},
-+ { .compatible = "fsl,ls1088a-ftm-alarm", .data = &ls1088a_rcpm_cfg},
-+ { .compatible = "fsl,ls208xa-ftm-alarm", .data = &ls208xa_rcpm_cfg},
-+ { .compatible = "fsl,lx2160a-ftm-alarm", .data = &lx2160a_rcpm_cfg},
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, ippdexpcr_of_match);
-+
-+static inline u32 ftm_readl(void __iomem *addr)
-+{
-+ if (big_endian)
-+ return ioread32be(addr);
-+
-+ return ioread32(addr);
-+}
-+
-+static inline void ftm_writel(u32 val, void __iomem *addr)
-+{
-+ if (big_endian)
-+ iowrite32be(val, addr);
-+ else
-+ iowrite32(val, addr);
-+}
-+
-+static inline void ftm_counter_enable(void __iomem *base)
-+{
-+ u32 val;
-+
-+ /* select and enable counter clock source */
-+ val = ftm_readl(base + FTM_SC);
-+ val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK);
-+ val |= (FTM_SC_PS_MASK | FTM_SC_CLK(FTM_SC_CLKS_FIXED_FREQ));
-+ ftm_writel(val, base + FTM_SC);
-+}
-+
-+static inline void ftm_counter_disable(void __iomem *base)
-+{
-+ u32 val;
-+
-+ /* disable counter clock source */
-+ val = ftm_readl(base + FTM_SC);
-+ val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK);
-+ ftm_writel(val, base + FTM_SC);
-+}
-+
-+static inline void ftm_irq_acknowledge(void __iomem *base)
-+{
-+ unsigned int timeout = 100;
-+
-+ while ((FTM_SC_TOF & ftm_readl(base + FTM_SC)) && timeout--)
-+ ftm_writel(ftm_readl(base + FTM_SC) & (~FTM_SC_TOF),
-+ base + FTM_SC);
-+}
-+
-+static inline void ftm_irq_enable(void __iomem *base)
-+{
-+ u32 val;
-+
-+ val = ftm_readl(base + FTM_SC);
-+ val |= FTM_SC_TOIE;
-+ ftm_writel(val, base + FTM_SC);
-+}
-+
-+static inline void ftm_irq_disable(void __iomem *base)
-+{
-+ u32 val;
-+
-+ val = ftm_readl(base + FTM_SC);
-+ val &= ~FTM_SC_TOIE;
-+ ftm_writel(val, base + FTM_SC);
-+}
-+
-+static inline void ftm_reset_counter(void __iomem *base)
-+{
-+ /*
-+ * The CNT register contains the FTM counter value.
-+ * Reset clears the CNT register. Writing any value to COUNT
-+ * updates the counter with its initial value, CNTIN.
-+ */
-+ ftm_writel(0x00, base + FTM_CNT);
-+}
-+
-+static u32 time_to_cycle(unsigned long time)
-+{
-+ u32 cycle;
-+
-+ cycle = time * alarm_freq;
-+ if (cycle > MAX_COUNT_VAL) {
-+ pr_err("Out of alarm range.\n");
-+ cycle = 0;
-+ }
-+
-+ return cycle;
-+}
-+
-+static u32 cycle_to_time(u32 cycle)
-+{
-+ return cycle / alarm_freq + 1;
-+}
-+
-+static void ftm_clean_alarm(void)
-+{
-+ ftm_counter_disable(ftm1_base);
-+
-+ ftm_writel(0x00, ftm1_base + FTM_CNTIN);
-+ ftm_writel(~0U, ftm1_base + FTM_MOD);
-+
-+ ftm_reset_counter(ftm1_base);
-+}
-+
-+static int ftm_set_alarm(u64 cycle)
-+{
-+ ftm_irq_disable(ftm1_base);
-+
-+ /*
-+ * The counter increments until the value of MOD is reached,
-+ * at which point the counter is reloaded with the value of CNTIN.
-+ * The TOF (the overflow flag) bit is set when the FTM counter
-+ * changes from MOD to CNTIN. So we should using the cycle - 1.
-+ */
-+ ftm_writel(cycle - 1, ftm1_base + FTM_MOD);
-+
-+ ftm_counter_enable(ftm1_base);
-+
-+ ftm_irq_enable(ftm1_base);
-+
-+ return 0;
-+}
-+
-+static irqreturn_t ftm_alarm_interrupt(int irq, void *dev_id)
-+{
-+ ftm_irq_acknowledge(ftm1_base);
-+ ftm_irq_disable(ftm1_base);
-+ ftm_clean_alarm();
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static ssize_t ftm_alarm_show(struct device *dev,
-+ struct device_attribute *attr,
-+ char *buf)
-+{
-+ u32 count, val;
-+
-+ count = ftm_readl(ftm1_base + FTM_MOD);
-+ val = ftm_readl(ftm1_base + FTM_CNT);
-+ val = (count & MAX_COUNT_VAL) - val;
-+ val = cycle_to_time(val);
-+
-+ return sprintf(buf, "%u\n", val);
-+}
-+
-+static ssize_t ftm_alarm_store(struct device *dev,
-+ struct device_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ u32 cycle;
-+ unsigned long time;
-+
-+ if (kstrtoul(buf, 0, &time))
-+ return -EINVAL;
-+
-+ ftm_clean_alarm();
-+
-+ cycle = time_to_cycle(time);
-+ if (!cycle)
-+ return -EINVAL;
-+
-+ ftm_set_alarm(cycle);
-+
-+ return count;
-+}
-+
-+static struct device_attribute ftm_alarm_attributes = __ATTR(ftm_alarm, 0644,
-+ ftm_alarm_show, ftm_alarm_store);
-+
-+static int ftm_alarm_probe(struct platform_device *pdev)
-+{
-+ struct device_node *np = pdev->dev.of_node;
-+ struct resource *r;
-+ int irq;
-+ int ret;
-+ struct rcpm_cfg *rcpm_cfg;
-+ u32 ippdexpcr, flextimer;
-+ const struct of_device_id *of_id;
-+ enum pmu_endian_type endian;
-+
-+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!r)
-+ return -ENODEV;
-+
-+ ftm1_base = devm_ioremap_resource(&pdev->dev, r);
-+ if (IS_ERR(ftm1_base))
-+ return PTR_ERR(ftm1_base);
-+
-+ of_id = of_match_node(ippdexpcr_of_match, np);
-+ if (!of_id)
-+ return -ENODEV;
-+
-+ rcpm_cfg = devm_kzalloc(&pdev->dev, sizeof(*rcpm_cfg), GFP_KERNEL);
-+ if (!rcpm_cfg)
-+ return -ENOMEM;
-+
-+ rcpm_cfg = (struct rcpm_cfg *)of_id->data;
-+ endian = rcpm_cfg->big_endian;
-+ flextimer = rcpm_cfg->flextimer_set_bit;
-+
-+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pmctrl");
-+ if (r) {
-+ rcpm_ftm_addr = devm_ioremap_resource(&pdev->dev, r);
-+ if (IS_ERR(rcpm_ftm_addr))
-+ return PTR_ERR(rcpm_ftm_addr);
-+ if (endian == BIG_ENDIAN)
-+ ippdexpcr = ioread32be(rcpm_ftm_addr);
-+ else
-+ ippdexpcr = ioread32(rcpm_ftm_addr);
-+ ippdexpcr |= flextimer;
-+ if (endian == BIG_ENDIAN)
-+ iowrite32be(ippdexpcr, rcpm_ftm_addr);
-+ else
-+ iowrite32(ippdexpcr, rcpm_ftm_addr);
-+
-+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "scrachpad");
-+ if (r) {
-+ scfg_scrachpad_addr = devm_ioremap_resource(&pdev->dev, r);
-+ iowrite32(ippdexpcr, scfg_scrachpad_addr);
-+ }
-+ }
-+
-+ irq = irq_of_parse_and_map(np, 0);
-+ if (irq <= 0) {
-+ pr_err("ftm: unable to get IRQ from DT, %d\n", irq);
-+ return -EINVAL;
-+ }
-+
-+ big_endian = of_property_read_bool(np, "big-endian");
-+
-+ ret = devm_request_irq(&pdev->dev, irq, ftm_alarm_interrupt,
-+ IRQF_NO_SUSPEND, dev_name(&pdev->dev), NULL);
-+ if (ret < 0) {
-+ dev_err(&pdev->dev, "failed to request irq\n");
-+ return ret;
-+ }
-+
-+ ret = device_create_file(&pdev->dev, &ftm_alarm_attributes);
-+ if (ret) {
-+ dev_err(&pdev->dev, "create sysfs fail.\n");
-+ return ret;
-+ }
-+
-+ alarm_freq = (u32)FIXED_FREQ_CLK / (u32)MAX_FREQ_DIV;
-+
-+ ftm_clean_alarm();
-+
-+ device_init_wakeup(&pdev->dev, true);
-+
-+ return ret;
-+}
-+
-+static const struct of_device_id ftm_alarm_match[] = {
-+ { .compatible = "fsl,ftm-alarm", },
-+ { .compatible = "fsl,ls1012a-ftm-alarm", },
-+ { .compatible = "fsl,ls1021a-ftm-alarm", },
-+ { .compatible = "fsl,ls1043a-ftm-alarm", },
-+ { .compatible = "fsl,ls1046a-ftm-alarm", },
-+ { .compatible = "fsl,ls1088a-ftm-alarm", },
-+ { .compatible = "fsl,ls208xa-ftm-alarm", },
-+ { .compatible = "fsl,lx2160a-ftm-alarm", },
-+ { .compatible = "fsl,ftm-timer", },
-+ { },
-+};
-+
-+static struct platform_driver ftm_alarm_driver = {
-+ .probe = ftm_alarm_probe,
-+ .driver = {
-+ .name = "ftm-alarm",
-+ .owner = THIS_MODULE,
-+ .of_match_table = ftm_alarm_match,
-+ },
-+};
-+
-+static int __init ftm_alarm_init(void)
-+{
-+ return platform_driver_register(&ftm_alarm_driver);
-+}
-+device_initcall(ftm_alarm_init);
projects / openwrt / staging / stintel.git / blobdiff